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<asp:TreeView onclick="postbackOnCheck()" ID="treeContent"
runat="server"> ... And so on ... </TreeView> This way I get full postback each time the user checks\unchecks the checkbox.

But now I want to modify this code in order to make use of AJAX: I don't want the FULL postback, but I only want the tree itself to be updated. Of course, I've started by placing it inside the UpdatePanel. But what now? Can somebody help me with this issue?

Re: TreeView checkboxes AutoPostBack with AJAX

No, that won't work for me... There has to be a postback, because my tree is dynamic, it is filled in "lazy" mode on server-side. So I can't check the checkboxes on the client-side - they may not exist there at all...

Do you know how can I update the update panel on the client-side? I know that there is some way using PageRequestManager... But I can't find how exactly this works. This is the only thing I need to solve the issue now...

Re: TreeView checkboxes AutoPostBack with AJAX

Originally Posted by Dmitry Perets

Do you know how can I update the update panel on the client-side?

That is exactly what I am trying to show you. AJAX sends data to the server and then sends the data back to the client-side. Did you even browse into the link I posted? There are more pages there to browse. Read the whole AJAX section.

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